| 摘要 |
A system for the automatic zero setting of scales having digital display of the weight is provided so that at tare weight of a bridge mechanism connected to a weighing pan of the scale the display will be as closely equal to zero as possible. Amplifiers and a voltage/frequency transducer are connected to the electrical measuring bridge. A presettable counter connects with the voltage/frequency transducer. The counter is preset so that at tare weight of the bridge mechanism the reading of the scale will be as close to zero as possible. In the path of the information going to the counter a correction unit is arranged. The count provided by the counter is observed by a differentiating unit for detecting deviations of a given magnitude in one direction or the other from a count value which produces a zero indication. The differentiating unit then supplies the correction order and direction of correction to the correction unit. |
